package com.hotacorp.opencloud.authserver.granter;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Objects;

import org.apache.commons.lang3.StringUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.security.authentication.AbstractAuthenticationToken;
import org.springframework.security.authentication.AccountStatusException;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.oauth2.common.exceptions.InvalidGrantException;
import org.springframework.security.oauth2.provider.ClientDetails;
import org.springframework.security.oauth2.provider.ClientDetailsService;
import org.springframework.security.oauth2.provider.OAuth2Authentication;
import org.springframework.security.oauth2.provider.OAuth2Request;
import org.springframework.security.oauth2.provider.OAuth2RequestFactory;
import org.springframework.security.oauth2.provider.TokenRequest;
import org.springframework.security.oauth2.provider.token.AbstractTokenGranter;
import org.springframework.security.oauth2.provider.token.AuthorizationServerTokenServices;

/**
 * 新增用户名、密码、图片验证码验证，当需要用图片验证码验证时，authorized_grant_types应该包含validatecode
 * @author lwg
 *
 */
public class UserNamePassWordCodeTokenGranter extends AbstractTokenGranter {
	private static final String GRANT_TYPE = "validatecode";
	private static final String VALIDATE_CODE_OAUTH_KEY = "validateCode:oauth";

	private StringRedisTemplate stringRedisTemplate;
	private final AuthenticationManager authenticationManager;

	public UserNamePassWordCodeTokenGranter(AuthenticationManager authenticationManager, AuthorizationServerTokenServices tokenServices,
			ClientDetailsService clientDetailsService, OAuth2RequestFactory requestFactory, StringRedisTemplate stringRedisTemplate) {
		super(tokenServices, clientDetailsService, requestFactory, GRANT_TYPE);
		this.stringRedisTemplate = stringRedisTemplate;
		this.authenticationManager = authenticationManager;
	}

	@Override
	protected OAuth2Authentication getOAuth2Authentication(ClientDetails client, TokenRequest tokenRequest) {
        Map<String, String> parameters = new LinkedHashMap<>(tokenRequest.getRequestParameters());
        String uuid = parameters.get("uuid");
        String validateCode = parameters.get("validatecode");
		String username = parameters.get("username");
		String password = parameters.get("password");
		// Protect from downstream leaks of password
		parameters.remove("password");
		
		if (StringUtils.isEmpty(uuid)) {
        	throw new InvalidGrantException("调用错误！");
		}
		if (StringUtils.isEmpty(validateCode)) {
        	throw new InvalidGrantException("验证码不能为空！");
		}
        String validatecodeString = stringRedisTemplate.boundValueOps(VALIDATE_CODE_OAUTH_KEY + ":" + uuid).get();
        if (!Objects.equals(validateCode, validatecodeString)) {
        	throw new InvalidGrantException("验证码错误！");
        }
        
		Authentication userAuth = new UsernamePasswordAuthenticationToken(username, password);
		((AbstractAuthenticationToken) userAuth).setDetails(parameters);
		try {
			userAuth = authenticationManager.authenticate(userAuth);
		}
		catch (AccountStatusException ase) {
			//covers expired, locked, disabled cases (mentioned in section 5.2, draft 31)
			throw new InvalidGrantException(ase.getMessage());
		}
		catch (BadCredentialsException e) {
			// If the username/password are wrong the spec says we should send 400/invalid grant
			throw new InvalidGrantException(e.getMessage());
		}
		if (userAuth == null || !userAuth.isAuthenticated()) {
			throw new InvalidGrantException("Could not authenticate user: " + username);
		}
		stringRedisTemplate.delete(VALIDATE_CODE_OAUTH_KEY + ":" + uuid);
		OAuth2Request storedOAuth2Request = getRequestFactory().createOAuth2Request(client, tokenRequest);		
		return new OAuth2Authentication(storedOAuth2Request, userAuth);
	}

}
